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Clock Repair HelpClock Movement Clock Parts

Clock Keys

Here we have clock keys in all the sizes available. We get many calls asking what key their clock takes and over the phone it is difficult to say you need key size this or that. Best to read the below text on how to use the clock keys chart and get the correct sized key to wind your clock. What can be said is most larger German movements take a number 8 key. So if your clock movement is made in Germany, is 5 x 5 square or 6 x 9, it will take a number 8 usually. If the clock movement is made in Germany and it's round or a small rectangle it's usually number 4. If you have a 31 day clock, or a Korean clock, or a commonly produced early American time strike movement, then it's usually number 7. However, if you want to be sure with all this then use the below chart.


To get the key you need, measure the shaft the key is to go on to, then use this chart to get the key size # you need. Please do not call asking what key your clock needs, as you will be told it would still have to be measured. Again, you are measuring the shaft that the key goes onto in MM and then using the below chart.

1 CM = 10 MM

25.4 MM (2.54 CM) = 1 inch

Most modern German wall or table clocks (post 1960) takes number 8 or 4 key

  • Size Key Needed
  • 3/0
  • 2/0
  • 0
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • Shaft Width in MM
  • 1.75
  • 2.0
  • 2.25
  • 2.5
  • 2.75
  • 3.0
  • 3.25
  • 3.5
  • 3.75
  • Size Key Needed
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • Shaft Width in MM
  • 4.0
  • 4.25
  • 4.5
  • 4.75
  • 5.00
  • 5.25
  • 5.5
  • 5.75
  • 6.0

13 Clock keys

clock keys
The most common sizes in a assortment of single and double ended keys

Item #CK1-- $35

Double End

clock keys
Four most popular double end clock keys. There is always much confusion for people to get the proper double end key, so we offer this set of 4 keys most frequently used. These have the Small end for regulating some clocks as well as the end to wind.

Item #CK2-- $19

Schatz 400 Day

clock keys
#3 size for lantern style 400 day clocks

Item #CK3-- $12

Brass Single End

clock keys
Available in many sizes This is the most popular choice on this page. Please use the key chart to find out what key you would need.

Item #CK4

Alarm Keys

clock keys
Two dozen assorted keys and setter knobs for alarm clocks.

Item #CK5-- $13

Grandfather Crank

clock keys
Available in 5 sizes. This crank is brass with a wood handle.

Item #CK6-- $19

OGee Clock Key

clock keys
Available in 0 to 13. This crank is usually used for the OGee mantle clock.

Item #CK7

5 Prong Key Set x2

clock keys
These two 5 prong clock keys will cover just about every clock winder.

Item #CK8 -- $19

GF Clock Crank #8

clock keys
#8 Crank -fits just about all modern clocks such as Hermle, and Kieninger.

Item #CK9-- $19

French Style

clock keys
Available in all sizes. Please use the key size chart on the top of the page.

Item #CK10

Door Key

clock keys
This door key fits most modern clocks such as Howard Miller and others.

Item #CK11-- $9

Hermle Key

clock keys
#8 Key -fits most Large Hermle model clocks, #4 Key -fits most Small Hermle model clocks.

Item #CK12

Clock Key Gauge

clock keys
If you have many keys and do not know what size they are, this gauge will help. Just put the key on the correct post and it will tell you what size it is.

Item #CK13-- $21

Have a clock keys question? Send us an E-Mail
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